Earth absorbs only a fraction of incident sun energy. Can we consider it as blackbody according to the given information? Not sufficient information it depends on complexity of the problem Yes No

Q: A spherical stainless-steel tank, 5 m outside diameter, contains hot flue gas. The outer surface…

A: Given data,  d= 5m  So area A=π*d2= π*52 = 78.54 m2  T= 500 °C = 773 K  And for grey body,…

Q: Calculate the (τα) product for a two-glass-cover collector (KL = 0.0370 per plate) with a flat black…

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Q: According to Planck's law of black- body radiation, the spectral energy density R as a function of…

A: We need to plot the graph using matlab.

Q: What is the average or total emissivity of the given radiation shields? Note: the radiation shield…

A: GIVEN THAT : E1 = 0.02 E2 = 0.03 According to the details provided in the question, we need to…

Q: 1. A circular furnace has 2 end black surfaces and surface 1 is kept at 500 K and surface 2 is kept…

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Q: At midday when a black paved airport runway is directly under the Sun, it receives 800 W of solar…

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Q: Find the view factors of the designated sides 1&3; and 1,2&3 to their surroundings in terms of a&b:…

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Q: You are using a heated cylindrical tube blackbody as a chamber for an experiment.  The tube is 2m…

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Q: A small sphere has a radius of 3.50 cm and is maintained at a temperature of 360°C. Assuming it to…

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Q: the total power emitted by a Black Body at a temperature of 2000 K with wavelength range A= 1.5 um –…

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Q: The peak wavelength of radiation emitted by a black body at a temp peak wavelength of emitted…

A: Given data⇒ Peak wavelength of radiation emitted by the blackbody  λm1=1.45 μm Temperature (T1)=2000…

Q: For a pair of blackbodies surrounded by an adiabatic wall and separated by vacuum, show   if  and…

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Q: Two concentric spheres of diameter D₁ = 0.9 m and D₂ = 1.2 m are separated by an air space and have…

A: Given that: For two concentric spheres, D1 = 0.9 m, D2 = 1.2 m, T1 = 400 K and T2 = 300 K (a)…

Q: Consider a 20-cm-diameter spherical ball at 800 K suspended in air. Assuming the ball closely…

A: Given data as per question Diameter of sphere = 20 cm Sphere temperature = 800 k wavelength = 3um

Q: Assuming sun to be a black body emitting radiation with maximum intensity at A = 0.5 u calculatione…

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Q: The wavelength at which the Sun emits its most intense light is about 550nm. Assuming the Sun…

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Q: 1.5) Fill in the blanks: A body whose surface properties are independent of wavelength is said to be…

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Q: Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 150°C,…

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Q: Consider a blackbody at 300K with maximum emissive power. Calculate the wavelength (Im) of the…

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Q: The emissive power of a blackbody is P. If its absolute temperature is doubled, the emissive power…

A: Solution: Given dataEmissive power of black body (Eb)1 = P T1=TT2=2T

Q: Light from an ideal spherical blackbody 15.0 cm in diameteris analyzed by using a diffraction…

A: Given data: The diameter of the black body is d=15 cm The angle is θ=14.4°

Q: the outer surface temperature of the furnace should be kept below 45°C. Based on the above…

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Q: Wavelength, à Consider the diagram given above. Which one of the following is correct? (a) Curve A…

A: Explaining monochromatic emissive power with respect to wave length. Explaining the gas - gas…

Q: arth absorbs only a fraction of incident sun energy. Can we consider it as blackbody according to…

A: According to the definition of blackbody, it is a body that absorbs all the radiation that falls on…

Q: A directionally emitting surface has an emissivity of 0.7 for angles up to 45° from vertical and 0.2…

A: Solution: Emissivity = 0.7 for angles upto 45 degrees Emissivity =0.2 for rest of the angles

Q: Assuming the sun to be a black body emitting radiation with maximum intensity at 1 = 0.48u m,…

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Q: A small surface of area A1 = 5 cm? emits radiation as a blackbody, and part of the radiation emitted…

A: Given data: A1=5 cm2A2=8 cm2Q˙1-2=274×10-6 W Need to determine the intensity of radiation emitted by…

Q: Consider a 20-cm-diameter spherical ball at 800 K suspended in air as shown in the figure. Assuming…

A: Solution:-   Given data:    D=20cm    T=800K   take σ=5.67×10-8w/mLK4    A=4πR2…

Q: A furnace is of cylindrical shape with R = H = 2 m. The base, top, and side surfaces of the furnace…

A: Given: The height of the cylindrical shape, H = 2 m The radius of the cylindrical surface, R = 2 m…

Q: If the surrounding surfaces have the same temperature as the gas, what is the total (convection plus…

A: Given                                Area, A = 1 m2 Heat transfer coefficient, h = 30 W/m2K…

Q: Define Emissivity of some materials at 300 K.

A: Thermal emissivity(ɛ) coefficient gives the heat or radiation absorbing and emission  capacity of a…

Q: The filament of a 75-W light bulb may be considered a blackbody radiating into a black enclosure at…

A: Given Data Energy radiated per second is: q=75 W Length of the filament is: l=5 cm=0.05 m The…

Q: Consider a cubic body 20 cm × 20 cm × 20 cm at 750 K suspended in air. Assuming that the body…

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Q: How can you determine the view factor F12 whenthe view factor F21 and the surface areas are…

A: Reciprocity theorem: The reciprocity theorem is used to determine the view factor F12 when areas of…

Q: 8. A black body has an effective surface temperature of rmine: (a) The total radiation energy (W/m²)…

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Q: A surface gains 500 W/m2 heat at an equilibrium temperature of 30 °C and it is subjected to a…

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Q: what is the difference between the emissive power and irradiance

A: **As per company policy we are supposed to do only 1 question if you need the rest question repost…

Q: A cylindrical shape is with diameter of 1.2m and length of 1.2m. The top surface has an emissivity…

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Q: An opaque surface at 1000 K if its spectral emissivity is = 0.4, 0.7, and 0.3 for 0 < < 2 μm, 2μm =…

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Q: A black body has a temperature of 3000 Kelvin. What is the wavelength of peak radiation emanating…

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Q: The spectral emissivity and spectral reflectivity of a diffuse surface are given below: 1.0 0.2 0.2…

A: The diffuse surface in the radiation is defined as the surface for which the emissivity is not a…

Q: consider a 1m by 1m blackbody surface at ts = 300k. determine the blackbody emissive power.…

A: Given   Area, A = 1 m2 Temperature, T = 300 K Find Emissive power, E Total intensity, I Radiosity, J

Q: Explain the blackbody radiation and its effect?

A: Heat is transferred by three phenomenon 1. Heat Conduction 2. Convection 3. Radiation

Q: Q.10. The intensity of the radiation from an object is found to be a maximum at 2000 cm-1. Assuming…

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Q: 7. The emissive power of a blackbody, at 0.8 µm wavelength is measured as 1E5 W/m², m. Find the…

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.